1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec1fcb79545ad51b16ac1c36370f5067eb74bfe8ce955a8803de04afc4cd618. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8caf5d82-1070-48b8-971d-fc4d4b05f109.json and https://artists.proofprofile.net/proofs/artist/8caf5d82-1070-48b8-971d-fc4d4b05f109.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b5fe5b02a29268c96227d59804c7500b374135fc48d481c9a9cca7dade5ca3. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ba7c5b2377c54030f38cb46aec0e538f55b5161ab280072b8290583f56b981. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb8b8d95ecee81bca5dce79ae77f7485712f8f1b356b2c559d3a587ea790544. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd893baf81727227bcc53d5e68e9fe1f4ef9de00c847d772bf3fb4bb43d2f1e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42359b2b5a786b46f36c3ca6b383f47cc755696a3b2b6b1bfd0ced4b8fef2c5b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216308ea7d847e21b482baa527898e36f082b2e7ba2cdc52d71549b79cdbde27. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e260aa1f6732c18f201068fc1c4522b75ec91162691063017ad46641e24cb0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e9ca4a34d362ba2d6569e6307ee85806829c2a6bed8685f9ff434fb9806fa1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231124c6ef9b6dc7548c4db1f134e241803984f738aca9db2c5814a596cf26b3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17fb612040c86c4161a625fad412e60f3b902aea6ab5ec5ec332949bdbdf6cf. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94176364c7eff829e9b2cd2aea238852f76e5130918ed3a5fb7d2ee5b50c6698. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1acf673b839dd5b8fd862d85ec08077bc1bc2d7c73c01eb1404f6eb4b3c0fb. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbd515a7f3aaf8185151083069611f9776ca744e009379d25b254a8d86f97e7. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWHZ72000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749080af1e9ed2904ac94c713a64eca6ab87fb7068b3487e30de56295532fc7c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWI452400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ba861c617d9b1230792d234c489d8f275440fea07c6247338d50f8465c5817. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWCC32102494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81b169dec5dcc6d9d48b647320d8088989284f233fa048960efc82325aaafdc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWJA12100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6ba9855753f7e058ceaced32ea343e88870b8519890c3dba1c03cf8a703b99. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWCC31902579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43e59be7df299f6b9b8024e37da19b1370e495da4386ec4d32d6a336a7b3ff4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWAE31802442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcb193d413e38c8ca0d2f6bee74b368520501e57522c7b705c81c91a48b0514. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWAE31802443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0488d754246be25a765df898d80d6de523580b82341c871279ccd5122e2626b4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWAE31802444.